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Question

Premature leaf fall starts when the amount of


A

Auxin increases

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B

Auxin decreases

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C

Abscisic acid decreases

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D

Gibberellic acid decreases

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Solution

The correct option is B

Auxin decreases


In the autumn, auxin levels fall in the leaves causing a layer of cells at the base of the petiole to become more sensitive to rising level of ethene.Ethene causes leaf fall.

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